III. PORIFERA or SPONGIDA 
ARRANGED BY 
R. W. HAROLD ROW. 
CONTENTS 
PAGE 
I. Titles . . 2 
II. Subject Index : — 
General works, economics, and technique . . . . 3 
Anatomy . . . . . . . . . . . . - 3 
Physiology . . . . . . . . . . . . - . 3 
Development and growth . . . . . . . . . . 3 
Ethology . . . . . . . . . . . . . 3 
Variation, Phylogeny . . . . . . . . . . 4 
Distribution : — * 
Actual . . . . . . . . . . . . . . 4 
Fossil . . . . . . . . . . . . . . 4 
III. Systematic : — 
Porifera, general 
Oalcarea 
Non-Calcarea 
Myxospongida . . 
Hexactinellida . . 
Tetraxonida 
Homosclerophora 
Astrotetraxonida 
Sigmato tetraxonida 
Lithistida (vacant) 
Euceratosa 
Incertae sedis 
4 
4 
7 
7 
C* Ox Qx crc ^ 
